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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc940fa69e1c3baea4e066bf930a65d5e85ace65ce768a28f0f74c5f283b773e' 
  AND token = 'BluKYJVrf0UEGDjmgKkt53eXwuIYJ3CCbi1MbGsu6K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}